FX M4 impact issues

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Vetmx said:
The little black .22 slugger is a sweetheart. I absolutely love shooting it. Power Blocked it because it was a pre Power Block gun but switched it back. Built some barrels for it but I’m back on a modded FX barrel. And no tension necessary. I will say this. If you have three compacts sitting sided by side in .22, .25 and .30 then shoot them for a year, the clear winner is the .22. For a multitude of reasons. Can the others do stuff, yes. But to put it bluntly, they aren’t happy about it. My little .25 slugger is 910fps. Any faster, and it will easily do it, the gun is just….well…wrong.
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I don't know this in fact, but i wouldn't have thought tensioning would benefit anthing except 700 and longer very much. The thought process being fx was 600mm forever so the design might be engineered around handling that loading. I only tensioned mine to lessen some whipping issues during my short lived 1000fps 34 grain phase.

Which brings us full circle. Here's where i noticed some things about the hammer I didn't like and some need for a reevaluation of the hammer, valve and rod setup I was using when i started to see velocities get super inconsistent but start to show weird sweet spots in certain conditions. That's where I started to see the impact like a musical instrument.
 
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6gun said:
I don't know this in fact, but i wouldn't have thought tensioning would benefit anthing except 700 and longer very much. The thought process being fx was 600mm forever so the design might be engineered around handling that loading. I only tensioned mine to lessen some whipping issues during my short lived 1000fps 34 grain phase.

Which brings us full circle. Here's where i noticed some things about the hammer I didn't like and some need for a reevaluation of the hammer, valve and rod setup I was using when i started to see velocities get super inconsistent but start to show weird sweet spots in certain conditions. That's where I started to see the impact like a musical instrument.
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Yep
 
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Vetmx said:
Oh it shot great. But without going into detail, I will put it like this. I’m old school. If I buy a Rolex, I expect it to be made in Switzerland. I don’t care if you want to sell me a Rolex made somewhere else and it keeps just as accurate time, I want a Swiss made Rolex.
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I know little to nothing about that model, but if I'm picking up what your laying down I don't like what im thinking.
 
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6gun said:
I know little to nothing about that model, but if I'm picking up what your laying down I don't like what im thinking.
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I voiced my opinion in a DRS topic. And I will make certain people happy by not going on about it. When I realized that the new airgunner really doesn’t care about old school stuff like I do. All they care about is if it meets their needs. I just hold owning certain things in life to different standards.
 
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Motorhead said:
Ha !! ... you kill me :ROFLMAO:

I've got ZERO affiliation with the new owners of JSAR.
You got issues chase it down with them !!!
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Oh no sir this platform is yours I believe or I hope so because your creation has me on mission of a prefect woods walker!!

20241213_015922_HDR.jpg
 
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JaceSpace1369 said:
I have said it before and I'll say it again.

Airgun technologies.

FX can be great if you can figure them out, otherwise they're fickle bihtches, that once something breaks all hell breaks loose.

AGT vulcan 3 and uragan 2 come with accuracy and power right out of the box.
Their only downside is that they are very mechanical, so they are not the most quiet when you are hunting
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I was always thinking of a way to describe the sound in my right ear when shooting those things. I will go with mechanical. If you hold the gun out in front of you like a pistol, no sound. Absolutely quiet gun.
 
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addison said:
Oh no sir this platform is yours I believe or I hope so because your creation has me on mission of a prefect woods walker!!

View attachment 525812
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NOT my creation .... while I did work behind the scenes helping with R&D of some parts of the rifle, and worked in the factory just pre Covid era ... Done extensive R&D & modifications to my personal Raptor.
It ends there as I have refused to rework or fix issues other may have with there own JSAR rifles. Those issues go threw factory if you can contact them at all ?
 
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Motorhead said:
NOT my creation .... while I did work behind the scenes helping with R&D of some parts of the rifle, and worked in the factory just pre Covid era ... Done extensive R&D & modifications to my personal Raptor.
It ends there as I have refused to rework or fix issues other may have with there own JSAR rifles. Those issues go threw factory if you can contact them at all ?
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I respect that. I bought this second hand with reg creep which I suspect that the previous owner did while tuning. That he didn't mention it had which is fine. But I suspect it has a flat spot where the nylon ball sets in regulator. Well regardless thank you for your contribution to the R&D!
 
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addison said:
You guys every use the Black Arts Design Barrel band?
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I tried using the Huma barrel tensioner kit because it looked more appealing than the other kits at the time and it was cheaper. Also it definitely tensed up the barrel, there was always a massive POI shift to which ever side the rifle was laying on. It also made it louder than having the oem shroud on. Unless you're gonna run the 800mm barrel or the 30 at really high power, I wouldn't mess with one. Just get the carbon fiber sleeve insert and make sure your barrel liner is indexed correctly.
 
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JaceSpace1369 said:
I tried using the Huma barrel tensioner kit because it looked more appealing than the other kits at the time and it was cheaper. Also it definitely tensed up the barrel, there was always a massive POI shift to which ever side the rifle was laying on. It also made it louder than having the oem shroud on. Unless you're gonna run the 800mm barrel or the 30 at really high power, I wouldn't mess with one. Just get the carbon fiber sleeve insert and make sure your barrel liner is indexed correctly.
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The method of tensioning an Impact barrel makes no engineering sense at all.

When you perform a load analysis on the design you find the tension:

a. pulling the barrel through the clamp so over time with expansion and contraction due to temperature the barrel will slide forward and load the breech set screw.

b. places a torque on two long thin screws that attach the clamp to the trigger block so that any side load will twist that clamp and shift the POI.
 
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Troy Bakel said:
The method of tensioning an Impact barrel makes no engineering sense at all.

When you perform a load analysis on the design you find the tension:

a. pulling the barrel through the clamp so over time with expansion and contraction due to temperature the barrel will slide forward and load the breech set screw.

b. places a torque on two long thin screws that attach the clamp to the trigger block so that any side load will twist that clamp and shift the POI.
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That would've never come to mind. An issue I did experience similar to that, is that if you set up everything and you try to tighten the mod too much it pulls the barrels. I had to replace the block my Mk2 because of that.
 
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